Hypodermic syringe



june 25, 1929. A E, SMWH 1,718,605

HYPODERMI C SYRINGE Filed Jan. 28, 1928 lle f 38 47 li .'/4 54' am? 333# 35 a@ 37 36 f 37 INVENTOR. 59 Y ARTHUR E. sM/TH ATTORNEY.

' '18*is positioned. The

Patented June 25, 1929...v

UNI-TED STATES P xrlarrr omer..

ARTHUR-E. SMITH, F LOS NGELES, CALIFORNIA.

HYPODEBMIC SYRIITGE.

Application' led January 28, A19028. i Serial No. 250,124.

'This invention relates to improvements in hypodermic syringes'. Thege/neral object Aprovide an improved syringe of the class describedwhich is adapted to be loaded from the discharge end and having meansprovided whereby ampules of different length may be used in the syringe.

A further o bject of the invention is to provide a novel means forautomatically and correctly positioning the ampule in the syringe. j

Other objects of this invention will be apparent from the followingdescription taken in connection with the accompanying drawing; wherein:

ig. 1 is a central longitudinal section h my improved syrlnge showing anam u e operatively positioned therein for ma 'ng an injection.

Fig. 2 is an enlarged central longitudinal section of the loading anddischarging end of my improved syringe.

Fig. 3 is a bottom plan view of the syringe barrel.

Fig. 4 is a top capr and ig. 5 1s an enlarged section taken on line planview of the removable -5--5 of Fig. 1.

Referring to the drawings by reference characters I have indicated ahypodermic syringe embodying the features ofJny invention generally at10. This syringe as shown comprises a hollow body portion or barrel 12having at one end a solid head1?) formed integral with threaded at theop site end as at `14. The threads 14..extend om the end ofthe barreltowards the head 13 for a considerable distance. Oppositely disposedlongitudinal cut awa portions or notches 15 are provided in e threadedarea.

The barrel of the syringe -alsencluges adjacent the head 13, a fingergrip cross ar 16 which may be held in place by rings 16 secured to thebarrel 12 as by we A central longitudinal aperture 17 1s provided in thehead 13 in which a plunger rod lunger includes at one end anenlargedthumb piece 19 held in place by threads and' at the op osito endan enlarged head 20, in the under ace of which the barrel and beinginternally J various lengths may is provided a recess 21 shown as of alconical shape.

0 The head 13 also includes aligned opposltely disposed apertures 22which intersect the central aperture 17 at right angles. Within each ofthe apertures 22 Ivposition a slidable plug 23 which is adapted to beresiliently urged towards the central aperture 17 by a kcoiled'compression spring 24. The coiled springs 24 are shown as adapted to beretained in the apertures 22 by 4screw threaded plugs 25 which engagelike screw threads provided in the head.

The adjacent faces of the slidable plugs 23 are formed concave toconform to the periphery of the plugs 23 engage t e lunger 18 andprovide tension thereon whic maintains the plunger in any position towhich it may be stopped or adjusted.

4 The threaded end of the syringe barrel 12 is adapted to be closed by acap lndicated generally at 28. This cap includes a portion 29 having asleeve 30 extending therefrom' which is provided with external threadedoppositely disposed bosses 31 'which' are adapted to engage the threads14 of the barrel 12.

Secured to the body portion 29 and sur- -rounding the sleeve I provideanother sleeve 32. The body portion 29 of the cap also' includes atapered recess 33 which communicates with an oppositely disposed screwthreaded tapered recess 34 in which a threaded tip 35 of a hypodermicneedle hub 36 is adapted to be positioned.

As shown, a hollow hypodermic needle 37 is secured to the hub 36, andprojects beyond each end of the hub as at 38 and 39.

By constructing the syringe cap 28 as described it will be ap arent thatampules of usedinm improved syringe, since to accommodate t e ampules ofvarious lengths it is only necessary to adjust the sleeve 30.

The ampulewhich I have shownused inl connection with my improved,syringe is indicated generally at 40 v`'and includes a body portion 41provided at one end with a tapered neck 42' in which I preferably rovidea (peripheral groove 43. The end o the tapere neck to be ,closed by aresilient cap 44.

'I he cap 44 is preferabl made of a good grade of rubber and inclu es askirt portion 45`which is adapted to surround aportion body- 42 is leftopen, and is adapted l longer 18. The slidable v /gible metallicApartition 47 Th also be hermetically sealed closed by a franwhich ispreferably a metal `foil disk fused in place.

' the syringe cap recess 21 in the apparent that I face of the syringe10 the plun .31 thereof are positioned in The end of the ampule'body 41opposite the tapered neck 42 is shown as' adapted to be closed by astopper 48 which is normally spaced adjacent the end as shown in Fig. 1,and is adapted to be moved'within the ampule body. This stopper 48 ispreferably made of a goodf grade of rubber and the top surface is formedconical as at 49.

When it is desired to make an injection with my improved syringe 10 thecap 28 is removed and the ampule 40 positioned in the syringe so thatthe straightvopen end of the ampule body is positioned adjacent theinner syringe head 13. The cap 28 is then replaced on Vthe syringebarrel. When the cap-28 is positioned on tlie'syringe barrel 12 thethreaded portions 31 of the cap are positioned'in the grooves 15 in thebarrel 12 and the cap moved towards the head 13.

As the syringe cap 28 is thus moved the ampule cap enters the taperedrecess 33 and the en d 38 of the needle 37 punctures the ampiuI-c'ap,fractures the metallic portion 47 and projects into the ampule. After 28has been moved as far as possible towards the about a half- 'of aturnfto the right, whereupon thethreaded portions 31 of the cap engagethe threaded portion 14'of the syringe barrel 12 thus securing thesyringe cap 28 to-the barrel 12 and at the same time forcing the ampulecap 44 into fluid -tight engagement with the side walls of the conicalres the syrin cap 28 is being positioned on the syrin e arrel theconical rtion 49 of the ampu e stopper 48 enters t e conical lunger head20 and automaticallycorrect y positions the ampule in the s'yr barrel.

To m e an injection with my improved r 18 is moved towards t e syringecap 28 ereby moving the stopper and causing it to act as a piston toexpel the contents of the ampule `the hypodermic needle .37.

To remove the syrin cap 28 the cap is turned to theleft until t ethreaded portions the grooves 14 of the` syringe barrel 12, whereuponthe cap 28 maybe readily removed, from the barrel by mo'v it away fromthe syringe head 13.

From j e fore ing demption it will be internal rangible 'to alter theeffective `said barrel having a front and a rear porhead 13 it' isturned b ltionally engage said into and through hypodermic signature.

aye provided a novel form y l i of hypodermic syringe which can beeconomically manufactured, which is simple in con struction and highlyefiicient in use.

Having thus described my invention, I claim:

1.`An ampule including a body portion having a reduced tapered neck atone end, an metallicldiaphr fused to said neck to-close the same, a rubr member surrounding said neck and a stopper in said ampule and remotefrom said neck.

2. In a syringe device adapted to receive anv ampule, a barrelcomprising two members, Jsaid members being relatively movable length fthe barrel,

tion, a plunger rod supportedl in said 4rear portion and movable intosaid barrel, means on said front portion for en ing an am'- pule, saidfront portion inclu ing means for engaging a hypodermic needle.

amiule including a body portion having a re uced open ended tapered neckalt one end, i risilient t eopenen o sai ta redneck theo n end of saidtafpered neclglso being, closedleiy an internal rangible metallicportion and gosopper in the opposite end of said ampule 4. `In asyringe, a barrel, a closure head for one end of said barrel, said headbeing vformed integral with said barrel, a plunger rod movable Athroughsaid head and in said arrel, means in said head adapted to frictheopposite end of said barrel,'said cap including a body portion havin aconical recess therein, a sleeve and a iypodermic needle, said sleevehaving means thereon adapted to coact with for detachably secur' saidcap to said barrel, said means also iillowing use of ampules ofdifferent length in said syringe, an ainpule in said syringe, saidampule includi l a body portion having a reduced open end taipered neckat one end, a resilient ecatedtoclosetheo nendofsaidta n ,theo endosaidtaperedneckalso being clo by an internal frangible metallic portion,a sto per adjacent the opposite end of said amp e body, said'stopperincludin means adapted to coact with, means on sai plunger rod head toautomatically correctly position' said am' ule in said syringe, -saidneedl adapted when said cap is operatively positioned on said barrel topuncture said .ampule cap, fracture said metallic partition and entersaid ampule.

Inl testimony whereof, I hereunto aflix my cap adapted to close means onsaid barrel plunger rod, a cap for lli

